crackers

Adjective

Synonyms: balmy barmy bats batty bonkers buggy cracked daft dotty fruity haywire kooky

WordNet 3.0

Adjective (1)

informal or slang terms for mentally irregular“it used to drive my husband balmy”Synonyms: balmy barmy bats batty bonkers buggy cracked daft dotty fruity haywire kooky kookie loco loony loopy nuts nutty round the bend around the bend wacky whacky

Webster's Dictionary (GCIDE)

crackers \crackers\ adj. crazy. [informal or slang]

Syn: balmy, barmy, bats, batty, bonkers, buggy, cracked, daft, dotty, fruity, haywire, kooky, kookie, loco, loony, loopy, nuts, nutty, wacky. [WordNet 1.5]